<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var str = '<div>我是{{name}}</div>';

        // 定义正则
        var pattern = /{{([a-zA-Z]+)}}/;

        var result = pattern.exec(str);
        console.log(result);
        console.log(result[0]); // {{name}}
        console.log(result[1]); // name
    </script>
</body>

</html>